Submission #208093

#	Time	Username	Problem	Language	Result	Execution time	Memory
208093		dOAOb	Trol (COCI19_trol)	C++14	50 / 50	5 ms	376 KiB

trol

#include<iostream>
using namespace std;

#define int long long

#ifdef lioraju
	#define ndbg(x) 
#else
	#define ndbg(x) x
#endif

int f(int i)
{
	if (i<10) return i;
	
	int sum = 0;
	while (i)
		sum += i%10, i/=10;
	return f(sum);
}

int prv(int x)
{
	if (!x) return 0;
	
	int se = 0;
	for (int j=x-x%10+1;j<=x;j++)
		se += f(j);
	
	return (x/10)*45 + se + prv(x/10);
}

signed main()
{
	ndbg( ios::sync_with_stdio(0); cin.tie(0); );
	int q; cin>>q;
	for (int qi=0; qi<q; qi++)
	{
		int l, r; cin>>l>>r;
		cout<<prv(r)-prv(l-1)<<'\n';
	}
}

• Subtask 1: 50 / 50